I've read through this topic before, but never really sank in to me. Now I realize after you referred to the God of War game as people see it being only mythical as offensive to you. I myself have to stand corrected and apologize for being insensitive. You definitely have rarity in your veins.
I think the reason people think Greek Gods are considered mythology is because, as far as I know, there isn't temples to worship, people trying to convert, modern books, etc. If Christianity or any other religion today ceased existence of a place to worship, books, and converters, then Jesus and God would be a myth. But who is to say what is relevant in today's beliefs? A single god is the new belief. Something happened 2000 years ago to force mankind to believe in a single Deity.
In the new world Native Americans had their own beliefs that is something I am ignorant in myself being 16% Native American. I struggle everyday being Native, White (English, Italian, Scottish, French, Dutch, and Spanish (white). I know Spanish is European, but it's a double whammy knowing American whites don't like my heritage being Hispanic. And on top of that, I struggle with what my kind did to the Natives. I'm born a true American where everyone is accepted. I don't even know what I'm trying to say anymore. This is deep to me.
But I have learned to respect all beliefs. I continue to learn.